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Finding the Fourth Proportional to 138,755.16, 191,435.40 and 90,334.98

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Solution

The fourth proportional to 138,755.16, 191,435.40 and 90,334.98 is: 124,631.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,755.16 : 191,435.40 = 90,334.98 : x
  2. Step 2: Convert to fraction form
    138,755.16/191,435.40 = 90,334.98/x
  3. Step 3: Cross multiply
    138,755.16x = 191,435.40 × 90,334.98
  4. Step 4: Simplify right side
    138,755.16x = 17,293,313,030.29
  5. Step 5: Solve for x
    x = 17,293,313,030.29/138,755.16
  6. Step 6: Final answer
    x = 124,631.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.